首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   7173篇
  免费   162篇
各国政治   433篇
工人农民   308篇
世界政治   436篇
外交国际关系   267篇
法律   4425篇
中国政治   40篇
政治理论   1377篇
综合类   49篇
  2020年   72篇
  2019年   87篇
  2018年   117篇
  2017年   140篇
  2016年   148篇
  2015年   106篇
  2014年   137篇
  2013年   767篇
  2012年   146篇
  2011年   157篇
  2010年   149篇
  2009年   146篇
  2008年   176篇
  2007年   186篇
  2006年   191篇
  2005年   151篇
  2004年   142篇
  2003年   164篇
  2002年   132篇
  2001年   274篇
  2000年   235篇
  1999年   227篇
  1998年   96篇
  1997年   80篇
  1996年   71篇
  1995年   65篇
  1994年   75篇
  1993年   69篇
  1992年   122篇
  1991年   160篇
  1990年   155篇
  1989年   143篇
  1988年   148篇
  1987年   165篇
  1986年   159篇
  1985年   148篇
  1984年   131篇
  1983年   120篇
  1982年   81篇
  1981年   93篇
  1980年   68篇
  1979年   126篇
  1978年   87篇
  1977年   72篇
  1976年   57篇
  1975年   81篇
  1974年   87篇
  1973年   82篇
  1972年   56篇
  1971年   57篇
排序方式: 共有7335条查询结果,搜索用时 0 毫秒
221.
Early alcohol use is associated with multiple negative outcomes later in life, including substance use disorders. Identification of factors related to this very early risk indicator can help inform early prevention efforts. This study prospectively examined the relationship between childhood adversities and early initiation of alcohol use (by age 14) among Puerto Rican youth, the Latino subgroup at highest risk for alcohol use disorders in adulthood. The data come from the Boricua Youth Study, a longitudinal study of Puerto Rican youth in two sites (South Bronx, New York, and the standard metropolitan area of San Juan, Puerto Rico). We focus on youth who were ages 10 and older at Wave 1 [M age at Wave 1 (SE)?=?11.64(0.05), N?=?1259, 48.85?% females]. Twelve childhood adversities were measured at Wave 1 and include 10 adverse childhood experiences commonly studied and two additional ones (exposure to violence and discrimination) that were deemed relevant for this study’s population. Early initiation of alcohol use was determined based on youth report at Waves 1 through 3 (each wave 1 year apart). Cox proportional hazards models showed that, when considered individually, adversities reflecting child maltreatment, parental maladjustment, and sociocultural stressors were related to early initiation of alcohol use. Significant gender interactions were identified for parental emotional problems and exposure to violence, with associations found among girls only. Adversities often co-occurred, and when they were considered jointly, physical and emotional abuse, parental antisocial personality, and exposure to violence had independent associations with early alcohol use, with a stronger influence of exposure to violence in girls compared to boys. The accumulation of adversities, regardless of the specific type of exposure, increased the risk for starting to drink at a young age in a linear way. The associations between childhood adversities and early alcohol use were generally consistent across sociocultural contexts, in spite of differences in the prevalence of exposure to adversity. Our findings highlight the importance of targeting multiple adversities and expanding the notion of adversity to capture the experiences of specific groups more adequately.  相似文献   
222.
Abstract

Politicians, diplomats and analysts commonly assume that commitment to multilateralism and liberal norms is part of the EU’s very DNA. Increasingly, however, the EU’s commitment to the liberal global order is more selective. We demonstrate the shift to a more contingent liberalism by examining the EU’s recent record in relation to four different challenges: international trade; US leadership; Russian actions in the eastern neighbourhood; and security in the Middle East. We speculate on what this may portend for the EU’s self-identity, European interests and the integrity of the prevailing global order.  相似文献   
223.
224.
225.
This article is the first to statistically examine the reciprocal relationship between formal political institutions and political corruption. We argue that political corruption is an informal institution that allows nondemocratic leaders to build political support, act as a substitute for liberalizing concessions in the formal institutions of the state, and thereby extends the longevity of non-democratic regimes. Yet, whereas high corruption level will prevail in nondemocratic regimes, we expect the electoral constituency in democratic regimes to have the formal power to curb political corruption. We demonstrate that these expectations hold by estimating a dynamic multinomial regression model on data for 133 countries for the 1985–2008 period. Our model shows that high-corruption autocracies and hybrid regimes are more stable than their low-corruption counterparts, but that low-corruption democracies are more stable than high-corruption ones. For autocratic and hybrid regimes, the stability is due both to corruption making the formal institutions more resistant to democratization and that the formal institutions prevent reductions in corruption. Consistent democracies, on the other hand, are able to reduce corruption and become more stable as a result.  相似文献   
226.
227.
The article presents a study of the Danish YWCA from 1883 to 1940. The approach adopted is that of cultural analysis, drawing on inspiration from several fields, not least cultural anthropology and so‐called empowerment research (Habermas 1968). The YWCA building in Copenhagen is used as the starting‐point for exploring the YWCA as a culture and for a discussion of the religious, social and feminist issues of the YWCA.  相似文献   
228.
Previous studies have indicated homophily in depressive symptoms among adolescent friends, resulting from both peer selection and socialization processes. However, developmental differences and the role of school transitions in these processes have not been elucidated. A sample of 367 (51% female) adolescents was followed from 6th to 11th grade to investigate prospective relationships between adolescents’ and their friends’ depressive symptoms in middle school and in high school. Results revealed that students selected friends with similar levels of depressive symptoms after each school transition. Additionally, friends appeared to socialize adolescents to become more similar in depressive affect in late middle school years. These findings suggest normative selection effects after school transitions, followed by socialization effects in middle school, but not high school.  相似文献   
229.
Mexican American youth are at greater risk of school failure than their peers. To identify factors that may contribute to academic success in this population, this study examined the prospective relationships from 5th grade to 7th grade of family (i.e., human capital [a parent with at least a high school education], residential stability, academically and occupationally positive family role models, and family structure) and individual characteristics (i.e., externalizing symptoms, bilingualism, gender, and immigrant status) to the academic performance of 749 Mexican American early adolescents (average age = 10.4 years and 48.7% were girls in 5th grade) from economically and culturally diverse families as these youth made the transition to junior high school. Results indicated that while controlling for prior academic performance, human capital and positive family role models assessed when adolescents were in 5th grade positively related to academic performance in 7th grade. Further, being a girl also was related to greater 7th grade academic success, whereas externalizing symptoms were negatively related to 7th grade academic performance. No other variables in the model were significantly and prospectively related to 7th grade academic performance. Implications for future research and interventions are discussed.  相似文献   
230.
The longitudinal effects among self and identity processes, and between these processes and internalizing symptoms, are not well understood. As a result, the present study was designed to ascertain the over-time effects among identity commitment, reconsideration of commitments, and self-concept clarity, as well as to map the interplay of these self and identity processes with anxiety and depressive symptoms in early adolescence. A sample of 923 Dutch adolescents (mean age 12.4 years at Time 1; 49.3% female) participated at each of five annual assessments. Multivariate growth curve and cross-lagged panel models indicated that the association between self-concept clarity and commitment was bidirectional, that reconsideration occurs based on problems or dissatisfaction with self-concept clarity and with identity commitments, and that self-concept clarity (but not commitment or reconsideration) temporally precedes depressive and anxiety symptoms. Results are discussed in terms of the structure of the self-system and its associations with internalizing symptoms.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号